2017年年末からアメリカ全土が記録的な大寒波に襲われており、その寒さは水中を泳いでいるサメが死んでしまうほどとなっています。 Sharks are freezing to death in the US, due to a record cold winter — Quartz https://qz.com/1169540/sharks-are-freezing-to-death-in-the-us-due-to-a-record-cold-winter/ It's So Cold Outside That Sharks Are Actually Freezing to Death - VICE https://www.vice.com/en_ca/article/xw4gxk/its-so-cold-outside-that-sharks-are-actually-freezing-t